PerFluorinated Compound (PFC) Sample Collection Guidance The purpose of this document is to provide guidance on groundwater sampling protocols when collecting a sample(s) for PFCs. Detection of these compounds at very low levels can be influenced by materials that are present at the sampling site, materials used by the sampling agent, or sample container handling practices. The following table provides a summary of items that are likely to contain PFCs (i.e. prohibited items) and therefore should not be used by the sampling agent at the sampling site. Category Prohibited Items Allowable Items Pumps and Teflon® and other fluoropolymer High-density polyethylene (HDPE), Tubing containing materials low density polyethylene (LDPE) , or silicone tubing, peristaltic pump or stainless steel submersible pump Decontamination Decon 90 Alconox® or Liquinox®, potable water followed by deionized rinse. Sample Storage LDPE or glass bottles, PTFE-or Laboratory-provided sample and Preservation Teflon®-lined caps, chemical ice container -preferred; or, HDPE or packs polypropylene bottles, regular ice Field Waterproof/treated paper or field Plain Paper, metal clipboard, Documentation books, plastic clipboards, non- Sharpies®, pens Sharpie® markers, Post-It® and other adhesive paper products Clothing Clothing or boots made of or with Synthetic or cotton material, Gore-Tex™ or other synthetic previously laundered clothing water resistant and/or stain (preferably previously washed resistant materials, Tyvek® greater than six times) without the material use of fabric softeners Personal Care Cosmetics, moisturizers, hand Suncreens: Products (for day cream and other related products Alba Organics Natural of sample Yes to Cucumbers Aubrey Organics collection) Jason Natural Sun Block Kiss My Face Baby-safe sunscreens (‘free’ or ‘natural) Insect Repellents: Jason Natural Quit Bugging Me Repel Lemon Eucalyptus Herbal Armor California Baby Natural Bug Spray BabyGanics Sunscreen and Insect Repellents: Avon Skin So Soft Bug Guard-SPF 30 Food and Pre-packaged food, fast food Bottled water or hydration drinks Beverage wrappers or containers For samples collected from monitoring wells When feasible, use single-use, disposable polyethylene or silicone materials (tubing, bailers, etc.) for monitoring well purging and sampling equipment. When reuse of materials or sampling equipment across multiple sampling locations is necessary, follow project decontamination protocols with allowed materials identified in the table above, and incorporate collection of equipment rinseate blanks into sampling program, as appropriate. When using positive displacement/submersible pump sampling equipment, familiarize yourself with the sampling pump/accessory equipment specifications to confirm that device components are not made of nor contain Teflon® or PTFE. For samples collected during production well pumping tests If feasible, do not use Teflon® tape or pipe thread paste on pipe fittings or sampling tap threads on the pump discharge pipe. As with all other sample parameters, the sample for PFCs should be collected at the last hour (or hours) of the pumping portion of the testing program. Discharge water should be purged through the sampling tap on the discharge pipe for a minimum of 20 minutes prior to collection of samples. For samples collected from active production wells If feasible, avoid contact with any Teflon® tape or pipe thread paste on pipe fittings or sampling tap threads on the water supply discharge pipe. The sample for PFCs should be collected while the production well pump is operating, and, preferably, has been operating for at least one hour. Discharge water should be purged through the sampling tap on the discharge pipe for a minimum of 20 minutes prior to collection of samples. Sample collection method/sequence Using new nitrile gloves collect the sample for PFCs first, prior to collecting samples for any other parameters into any other containers; this avoids contact with any other type of sample container, bottles or package materials. As with all other samples, do not place the sample bottle cap on any surface when collecting the sample, and avoid all contact with the inside of the sample bottle or its cap. When sample is collected and capped, place the sample bottle(s) in an individual sealed plastic bag (e.g. Ziploc®) separate from all other sample parameter bottles, and place in shipping container packed only with ice. November 2016 .